Ecosystems Review

The table lists food some birds like to eat in nature.

In New England, seeds and berries are the only food available for most birds during the winter.

Which bird moves away to find food during the winter?

• Blue Jay

• Cardinal

• Chickadee

• Robin

Use the graph to answer the following question.

Which event explains what most likely happened at the beginning of month 3?

• More predators of species X were introduced.

• The prey of species X decreased in number.

• A disease that affected species X was introduced.

• A competitor of species X decreased in number.

The table shows how different water temperatures affect the annual number of eggs one type of fish produces.

Which statement predicts the effect warmer water temperatures would most likely have on this type of fish?

• The fish would quickly adjust to the new temperatures.

• The fish population would decline over time.

• The fish would lay eggs more often to produce enough eggs.

• The fish population would produce more females than males.

Use the picture to answer the following question.

Which of these lists only biotic factors of this ecosystem?

• fox, tree, grass

• sun, stream, cloud

• cloud, grass, rock

• stream, cloud, fox

Which example shows a relationship between a biotic factor and an abiotic factor?

• An insect is food for a salmon.

• Water carries a rock downstream.

• A tree removes a gas from the air.

• A flower makes food for a butterfly.

A wetland was drained to build a mall. Two years later, there were no more toads in that area. Why did the toads disappear?

• The toads were destroyed by the construction equipment.

• The toads died because toads cannot breathe out of water.

• The toads were frightened and went into the woods.

• The toads got their food from the wetland ecosystem.

Use the graph to answer the following questions.

Why did the owl population change?

What could have been done to prevent the change in the owl population?

Which model correctly shows energy flow in a food chain?

• 
• 
• 
• 

The picture shows an ocean bay food chain.

Sea otters move into the ocean bay. They eat all the sea urchins. This change will cause the...

• kelp to have less food.

• crabs to have more food.

• sea ducks to have less food.

• arctic foxes to have more food.

The diagram shows a cross section of a lake.

What part of the lake would most likely have the smallest number of producers?

• 1

• 2

• 3

• 4